Journal
INORGANIC CHEMISTRY
Volume 60, Issue 24, Pages 19197-19205Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.1c02938
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Funding
- National Natural Science Foundation of China (NNSFC) [22065039]
- NNSFC-Yunnan Joint Fund [U1702254]
- Science and Technology Department of Yunnan Province [202101AT070072, 2018HB038]
- Fundamental Research Funds for the Central Universities [2020ZYGXZR050]
- Guangzhou Science and Technology Planning Project [202102020125]
- Basic and Applied Basic Research Foundation of Guangdong Province [2021A1515012415]
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This study presents a new red-emitting phosphor RLGFM with an ultraintense ZPL emission and investigates its spectral characteristics and color gamut expansion capability. A comprehensive investigation on thermal quenching behavior provides detailed insights into developing novel Mn4+ red phosphors for high-quality backlight display applications.
The zero-phonon line (ZPL) of Mn4+, which highly depends on its local environment, is usually much weaker than the vibrational phonon sidebands. In this work, an ultraintense ZPL emission, coming from a brand new red-emitting Rb2LiGaF6:Mn4+ (RLGFM) phosphor upon blue light excitation, is presented. The interesting spectral characteristic originates from the nonequivalent substitution of Mn4+ for Ga3+ in a rigid octahedral structure with a low symmetry, which induces neighboring cation vacancies that distort the local symmetry of the [MnF6] octahedra. Benefiting from the ultraintense ZPL emission, a wide color gamut is achieved using RLGFM and beta-SiAlON:Eu2+ as color converters. Moreover, a comprehensive investigation on the thermal quenching behavior is also conducted to provide detailed insights to explore novel Mn4+ red phosphors for high-quality backlight display applications.
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